A ball dropped from the top of a building has a height of $s = 400 ? 16 t^{2}$ meters after $t$ seconds. How long does it take the ball to reach the ground? What is the ball's velocity at the moment of impact? A) $5 sec, ? 160 m / sec$ B) $10 sec, ? 80 m / sec$ C) $5 sec, 160 m / sec$ D) $25 sec, ? 800 m / sec$

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A ball dropped from the top of a building has a height of

s = 400 ? 16 t^{2}

meters after

t

seconds. How long does it take the ball to reach the ground? What is the ball's velocity at the moment of impact? A)

5 sec, ? 160 m / sec

B)

10 sec, ? 80 m / sec

C)

5 sec, 160 m / sec

D)

25 sec, ? 800 m / sec

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